90856477 has 2 divisors, whose sum is σ = 90856478. Its totient is φ = 90856476.

The previous prime is 90856471. The next prime is 90856481. The reversal of 90856477 is 77465809.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 18844281 = 8486^2 + 4341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90856477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90856471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45428238 + 45428239.

It is an arithmetic number, because the mean of its divisors is an integer number (45428239).

Almost surely, 2^90856477 is an apocalyptic number.

It is an amenable number.

90856477 is a deficient number, since it is larger than the sum of its proper divisors (1).

90856477 is an equidigital number, since it uses as much as digits as its factorization.

90856477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 90856477 is about 9531.8663964619. The cubic root of 90856477 is about 449.5575519510.

The spelling of 90856477 in words is "ninety million, eight hundred fifty-six thousand, four hundred seventy-seven".